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www.3peakic.com.cn Rev. B.2
1 / 17
TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Features
Dual bidirectional Translator for SDA and SCL Lines
in I2C Applications and SMBus Compatible
Support multi-mode: Standard-mode (SM), Fast-
mode (FM), and Fast-mode Plus (FM+)
Less than 1.5 ns (max) Delay to Accommodate SM
and FM I2C devices and multiple masters
Allows Voltage-Level Translation Between
◼ 3.3V VREF1 and 5V VREF2
◼ 2.5V VREF1 and 3.3V or 5 V VREF2
◼ 1.8V VREF1 and 2.5V, 3.3V, or 5V VREF2
◼ 1.2V VREF1 and 1.8V, 2.5V, 3.3V, or 5V VREF2
Provides bidirectional voltage translation with no
direction pin
High-impedance SCL1, SDA1, SCL2 and SDA2 pins
for EN = LOW
Latch-Up performance exceeds 400 mA per JESD
78
ESD Protection Exceeds JESD 22
◼ 4000-V Human-Body Model
◼ 1000-V Charged-Device Model
Applications
I2C, SMBus, PMBus, MDIO, UART, Low-Speed
SDIO, GPIO, and Other Two-Signal Interfaces
Servers/Storages
Routers (Telecom Switching Equipment)
Personal Computers/Consumer handsets
Industrial Automation
Description
The TPT29306 device is a dual bidirectional I2C and
SMBus voltage-level translator with an enable (EN) input,
and work from 1.2V to 3.6V VREF1 and 1.8V to 5.5V VREF2.
The 3.5Ω Ron make the minimal propagation delay <1.5ns.
If EN is high, the translator switch is ON, and the SCL1
and SDA1 I/O are connected to the SCL2 and SDA2 I/O,
will allow bidirectional data flow between ports. If EN is
low, the translator switch is off, and a high-impedance
state exists between ports to isolate both sides.
The TPT29306 can also be used to run two buses, one is
400 kHz and the other is 100 kHz. If the two buses are
operating at different frequency, the 100 kHz bus must be
isolated when the other 400 kHz bus is required. If the
master is running at 400 kHz, the maximum system
frequency may be less than 400 kHz because of the
delays added by the translator.
As with the standard I2C-bus system, pull-up resistors are
required in both sides, to provide the logic HIGH levels on
the translator’s bus. The device is designed to work with
SM, FM and FM+ I2C-bus devices in addition to SMBus
devices. The maximum frequency is dependent on the
RC time constant, but generally supports > 2 MHz.
TPT29306 is available in MSOP8, VSSOP8, DFN1.4X1-
8L and DFN3X4-8L(none e-pad) package, and is
characterized from –40°C to +85°C.
Function block
SCL2
SDA2
SCL1
SDA1
VREF1
GND
VREF2
8
7
6
5
1
2
3
4
SW
SW
EN
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Revision History
Date Revision Notes
2019/4/12 Rev. Pre 0.1 Initial Version
2019/9/7 Rev. Pre 0.2 Add DFN3X4-8L No e-pad package
2019/9/25 Rev. Pre 0.3 Add application notes
2019/12/23 Rev. Pre 0.4 Add ESD data
2020/4/20 Rev. Pre 0.5 Add test data
2020/10/26 Rev. Pre 0.6 Add VSSOP8 package information
2021/5/6 Rev. A.0 Release version
2021/12/9 Rev. B Update the order information
2022/2/9 Rev. B.1 Update the tape and reel information
2022/5/8 Rev. B.2 Update the MSL of TPT29306L1-DFER from MSL3 to MSL1
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Pin Configuration and Functions
Pin Functions
Pin name Pin No I/O Description
GND 1 — Ground, 0 V
VREF1 2 I Low-voltage-side reference supply voltage for SCL1 and SDA1
SCL1 3 I/O Serial clock, low-voltage side
SDA1 4 I/O Serial data, low-voltage side
SDA2 5 I/O Serial data, high-voltage side
SCL2 6 I/O Serial clock, high-voltage side
VREF2 7 I High-voltage-side reference supply voltage for SCL2 and SDA2, connect to power supply through external 200kΩ pull up resistor
EN 8 I Switch enable input, directly connect to VREF2
TPT29306L1-DFGR (DFN1.4X1-8L)
TPT29306L1-DFER (DFN3X4-8L)
TPT29306-VS1R (MSOP8, 3.0 x 3.0 x 0.9 mm)
TPT29306L1-VS3R (VSSOP8, 2.0 x 2.3 x 1.0 mm)
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Absolute Maximum Ratings (1)
Parameter MIN MAX UNIT
VREF1 DC reference voltage range –0.5 7 V
VREF2 DC reference bias voltage range –0.5 7 V
VI Input voltage range(2) –0.5 7 V
VI/O Input/output voltage range(2) –0.5 7 V
Continuous channel current 128 mA
IIK Input clamp current VI < 0 –50 mA
Tj(max) Maximum junction temperature 125 °C
Tstg Storage temperature range –65 150 °C
* Note: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. (1) This data was taken with the JEDEC low effective thermal conductivity test board. (2) This data was taken with the JEDEC standard multilayer test boards.
ESD, Electrostatic Discharge Protection
Symbol Parameter Condition Minimum Level
Unit
HBM Human Body Model ESD ANSI/ESDA/JEDEC JS-001 4 kV
CDM Charged Device Model ESD ANSI/ESDA/JEDEC JS-002 1 kV
Thermal Information Package Type θJA θJC Unit
MSOP8 205 45 °C/W
VSSOP8 210 82 °C/W
DFN1.4X1.0-8L 261 152 °C/W
DFN3X4-8L 71 29 °C/W
Recommended Operating Conditions Symbol Description MIN MAX UNIT
VI/O Input/output voltage SCL1, SDA1, SCL2, SDA2 0 5.5 V
VREF1 (1) Reference voltage 0 5.5 V
VREF2 (1) Reference voltage 0 5.5 V
EN Enable input voltage 0 5.5 V
IPASS Pass switch current 64 mA
TA Operating ambient temperature –40 85 °C
(1) To support translation, VREF1 suggest to be 0.6V lower than VREF2. Please see the Application information as reference.
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Electrical Characteristics
All test condition is VDD = 3.3V, TA = +25°C, RL = 150Ω to GND
Symbol Description Test Conditions Min Typ Max Unit
VIK Input clamp voltage note1 II = –18 mA, EN = 0 V –1.2 V
IIH Input leakage current VI = 5 V, EN = 0 V 5 μA
Ci(EN) Input capacitance VI = 3 V or 0 11 pF
Cio(off) Off capacitance, SCLn, SDAn VO = 3 V or 0, EN = 0 V 4 6 pF
Cio(on) On capacitance, SCLn, SDAn VO = 3 V or 0, EN = 3 V 10.5 12.5 pF
RON On-state resistance, SCLn, SDAn
VI = 0 IO = 64 mA
EN = 4.5 V 3.5 5.5
Ω
EN = 3 V 4.7 7
EN = 2.3 V 6.3 9.5
VI = 0 IO = 15 mA EN = 1.5 V 25.5 32
VI = 2.4 V(3) IO = 15 mA EN = 4.5 V 1 6 15
EN = 3 V 20 60 140
VI = 1.7 V(3) IO = 15 mA EN = 2.3 V 20 60 140
Note1: symbol ‘-‘ means direction, sink current 18mA, input voltage 1.2V, typical value: input voltage 0.8V
Switching Characteristics AC Performance, TA = +25°C (Translating Down) (Fig. 1)
AC Electrical Specifications, Translating Down, EN = 3.3 V,VIH = 3.3 V; VIL = 0 V; VM = 1.15 V
Parameter From (Input) To (Output) CL = 50 pF CL = 30 pF CL = 15 pF
Unit Min Max Min Max Min Max
tPLH SCL2 or SDA2 SCL1 or SDA1
0 0.8 0 0.6 0 0.3
ns tPHL 0 1.2 0 1 0 0.5
AC Electrical Specifications, Translating Down, EN = 2.5 V,VIH = 2.5 V; VIL = 0 V; VM = 0.75 V
Parameter From (Input) To (Output) CL = 50 pF CL = 30 pF CL = 15 pF
Unit Min Max Min Max Min Max
tPLH SCL2 or SDA2 SCL1 or SDA1
0 0.8 0 0.6 0 0.3
ns tPHL 0 1.2 0 1 0 0.5
Switching Characteristics AC Performance, TA = +25°C (Translating Up) (Fig. 6)
AC Electrical Specifications, Translating Up, EN = 3.3 V,VIH = 2.3 V; VIL = 0 V; VTT = 3.3 V; VM = 1.15 V; RL = 300
Parameter From (Input) To (Output) CL = 50 pF CL = 30 pF CL = 15 pF
UNIT Min Max Min Max Min Max
tPLH SCL2 or SDA2 SCL1 or SDA1
0 0.9 0 0.6 0 0.4
ns tPHL 0 1.4 0 1.1 0 0.7
AC Electrical Specifications, Translating Up, EN = 2.5 V,VIH = 1.5 V; VIL = 0 V; VTT = 2.5 V; VM = 0.75 V; RL = 300
Parameter From (Input) To (Output) CL = 50 pF CL = 30 pF CL = 15 pF
UNIT Min Max Min Max Min Max
tPLH SCL2 or SDA2 SCL1 or SDA1
0 0.9 0 0.6 0 0.4
ns tPHL 0 1.4 0 1.1 0 0.7
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Typical Performance Characteristics-TPT29306
Function Block Diagram
a. Load circuit b. Timing diagram
S1 = translating up; S2 = translating down.
CL includes probe and jig capacitance.
The outputs are measured one at a time, with one transition per measurement.
Figure 1. Load circuit for outputs
VTT
RL
S1
S2 (open) CL
From output under test
VIH
VM Input
Output
VOH
SCL2
SDA2
SCL1
SDA1
VREF1
GND
VREF2
8
7
6
5
1
2
3
4
SW
SW
EN
VM
VM
VM
VIL
VOL
TPT29306
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Theory of Operation
The TPT29306 device is a dual bidirectional I2C and SMBus voltage-level translator with an enable (EN) input and
operates without use of a direction pin. The voltage supply range for VREF1 is 1.0 V to 3.6 V and the supply range for
VREF2 is 1.65 V to 5.5 V.
The TPT29306 device can also be used to run two buses, one at 400 kHz frequency and the other at 100 kHz frequency.
If the two buses are operating at different frequencies, the 100 kHz bus must be isolated by using the EN pin when the
400 kHz operation of the main bus is required. If the master is running at 400 kHz, the maximum system operating
frequency may be less than 400 kHz because of the delays added by the level translator.
In I2C applications, the bus capacitance limit of 400 pF decides the number of devices and bus length. The capacitive
load on both sides of the TPT29306 device must be calculated together, including the total load of the system, then
make sure the sum of both sides is under 400 pF.
Both the SDA and SCL channels of the TPT29306 device have the same electrical characteristics, and there is minimal
deviation from one output to another in voltage or propagation delay. Compared to the discrete transistor voltage-
translation solutions, TPT29306 is a good benefit because of the symmetric design and accurate manufacture. The level
shifter provides excellent ESD protection to lower-voltage devices and also protects low-level ESD devices.
Enable (EN) Pin
The TPT29306 device is an open-drain circuit in which the gate of the transistors is controlled by the voltage on the EN
pin. In Figure 2 the TPT29306 device is always enabled when power is applied to VREF2. In Figure 3, the device is
enabled when a control signal from a processor is in a logic-high state.
Voltage Translation
The primary feature of the TPT29306 device is translating voltage from an I2C bus VREF1 to I2C bus VREF2. Side-1 is
referenced to VREF1 up to an I2C bus referenced to VDPU(VCC1), and side-2 VREF2 is connected through a 200 kΩ pullup
resistor. Translation on a standard, open-drain I2C bus is achieved by simply connecting pullup resistors from SCL1 and
SDA1 to VREF1, and connecting pullup resistors from SCL2 and SDA2 to VCC2.
Device Function table
Input EN(1) Translator Function
H SCL1 = SCL2, SDA1 = SDA2
L Disconnect
(1) The SCL switch conducts if EN is ≥ 1 V higher than SCL1 or SCL2. The same is true of SDA.
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Application information
General Applications of I2C
As with the standard I2C system, pullup resistors are required to provide the logic-high levels on the translator bus. The
size of these pullup resistors depends on the system, but each side of the repeater must have a pullup resistor. The
device is designed to work with standard-mode and fast-mode I2C devices, in addition to SMBus devices. Standard-
mode I2C devices only specify 3 mA in a generic I2C system where standard-mode devices and multiple masters are
possible. Under certain conditions, high termination currents can be used. When the SDA1 or SDA2 port is low, the
clamp is in the ON state, and a low-resistance connection exists between the SDA1 and SDA2 ports. Assuming the
higher voltage is on the SDA2 port when the SDA2 port is high, the voltage on the SDA1 port is limited to the voltage
set by VREF1. When the SDA1 port is high, the SDA2 port is pulled to the pullup supply voltage of the drain by the pullup
resistors. This functionality allows a seamless translation between higher and lower voltages selected by the user,
without the need for directional control. The SCL1-SCL2 channel also functions in the same way as the SDA1-SDA2
channel.
Typical Application
Figure 2 and Figure 3 show how these pullup resistors are connected in a typical application, as well as two options for
connecting the EN pin.
Power Supply Requirements
For supplying power to the TPT29306 device, the VREF1 pin can be connected directly to a power supply. The VREF2 pin
MUST be connected to the VCC2 power supply through a 200 kΩ resistor. Failure to have a high impedance resistor
between VREF2 and VDPU results in excessive current draw and unreliable device operation. It is also worth noting, that in
order to support voltage translation, the TPT29306 MUST have the EN and VREF2 pins shorted and then pulled up to
VCC2 through a high-impedance resistor (200 kΩ).
Bidirectional Voltage Translation
For the bidirectional clamping configuration, could be higher voltage to lower voltage or lower voltage to higher voltage,
the EN input must be connected to VREF2 and both pins pulled to high-side power supplier through a pullup resistor
(typically 200 kΩ as recommend above). This allows VREF2 to regulate the EN input and a 100 pF filter capacitor
connected to VREF2 is recommended. The I2C bus master output can be push-pull, if it is open-drain output then it should
connect to pullup resistors. However, if either output is push-pull, data(SDA) must be unidirectional or the outputs must
be 3-state capable and be controlled by some direction-control circuit to prevent high-to-low competition in either
direction. If both outputs are open-drain, no direction control is needed.
The reference supply voltage (VREF1) is connected to the core power-supply voltage of the I2C master, and VREF2 is
connect to the I2C slave through 200 kΩ pullup resistor.
Design Requirements
Min Typ(1) Max UNIT
VREF2 Reference voltage VREF1 + 0.6 2.1 5 V
EN Enable input voltage VREF1 + 0.6 2.1 5 V
VREF1 Reference voltage 1.2 1.5 4.4 V
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
IPASS Pass switch current 6 mA
IREF Reference-transistor current 5 μA
(1) All typical values are at TA = 25°C.
Typical Application Circuit
SW
SW
VREF1
SCL1
SDA1
GND
2
3
4
1
5
6
7
8
SDA2
SCL2
EN
VREF2
TPT29306
GND
SDA
SCL
MASTER
VCC
SLAVEI2C BUSDEVICE
GND
VCC
SCL
SDA
VCC1=1.8V
VCC2=3.3V
RPU RPU
RPU RPU
200KΩ
SW
SW
VREF1
SCL1
SDA1
GND
2
3
4
1
5
6
7
8
SDA2
SCL2
EN
VREF2
TPT29306
GND
SDA
SCL
MASTER
VCC
SLAVEI2C BUSDEVICE
GND
VCC
SCL
SDA
VCC1=1.8V
VCC2=3.3V
RPU RPU
RPU RPU
200KΩ
3.3V Enable
ON
OFF
Figure 2. Typical application circuit, switch always Enable
Figure 3. Typical application circuit, switch Enable control by I/O input
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Pullup Resistors
To get an estimate for the range of values that can be used for the pullup resistor, please refer to Figure 4 and Figure 5,
which shows the maximum and minimum pullup resistance allowable by the I2C specification for standard-mode (100
kHz) and fast-mode (400 kHz) operation.
No pullup resistor is needed on the host side (3.3 V) if the TPT29306 device is being driven by standard CMOS push-
pull output driver.
Figure 4. Maximum Pullup Resistance (Rpu(max)) vs Bus Capacitance (Cb)
Figure 5. Minimum Pullup Resistance (Rpu(min) as VCC1) vs Pullup Reference Voltage (VDPUX as VCC2)
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Bandwidth
The maximum frequency of the TPT29306 device depends on the application. The device can operate at speeds of >
100 MHz given the correct conditions. The maximum frequency is dependent upon the loading of the application. The
TPT29306 device acts as a standard switch, and the bandwidth of the device is decided by the on-resistance and on-
capacitance of the device.
Figure 6 shows a bandwidth measurement of the TPT29306 device using a two-port network analyzer.
Figure 6. Typical bandwidth reference
You can then use a simple formula to calculate the maximum frequency component (F0).
F0= 0.5 / RT (10%–90%)
F0 = 0.4 / RT (20%–80%)
For signals with rise-time characteristics based on 10% to 90% thresholds, F0 is equal to 0.5 divided by the rise time of
the signal. For signals with rise-time characteristics based on 20% to 80% thresholds, which is very common in many
current device specifications, F0 is equal to 0.4 divided by the rise time of the signal. The digital clock frequency of >100
MHz can be achieved.
Some guidelines to follow that help maximize the performance of the device:
• Keep trace length to a minimum by placing the TPT29306 device close to the I2C output of the master.
• The trace length should be less than half the time of flight to reduce ringing and line reflections or nonmonotonic
behavior in the switching region.
• To reduce overshoots, a pullup resistor can be added on the VREF1 side, then it will result a slower fall time.
-16
-14
-12
-10
-8
-6
-4
-2
0
2
4360000 43600000 436000000
Ban
d w
idth
(d
B)
Frequency (Hz)
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Tape and Reel Information
Order
Number
Package D1 W1 A0 B0 K0 P0 W0 Pin1
Quadrant
TPT29306-
VS1R
8-Pin MSOP 330.0 17.6 5.2 3.3 1.5 8.0 12.0 Q1
TPT29306L1-
VS3R
8-Pin VSSOP 178.0 15 2.25 3.35 1.4 4.0 8.0 Q3
TPT29306L1-
DFGR
DFN1.4X1.0-
8L
180 13.1 1.6 2 0.85 4 8 Q1
TPT29306L1-
DFER
DFN3X4-8L 330 12.8 3.3 4.3 1 8 12 Q2
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Package Outline Dimensions
VS1R (MSOP8)
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Package Outline Dimensions
VS3R (VSSOP8)
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Package Outline Dimensions
DFGR (DFN1.4X1.0-8L )
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Package Outline Dimensions
DFER (DFN3X4-8L, no e-pad)
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TPT29306
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
Order Information
Order Number Operating Temperature
Range Package
Marking
Information MSL
Transport Media,
Quantity Eco Plan
TPT29306-VS1R -40 to 85°C 8-Pin MSOP 9306 MSL3 Tape and Reel, 3000 Green
TPT29306L1-VS3R -40 to 85°C 8-Pin VSSOP8 9306 MSL1 Tape and Reel, 3000 Green
TPT29306L1-DFGR -40 to 85°C 8-Pin DFN1.4X1.0 T26 MSL1 Tape and Reel, 4000 Green
TPT29306L1-DFER -40 to 85°C 8-Pin DFN3X4
No e-pad 9306 MSL1 Tape and Reel, 3000 Green
(1). Future product, contact 3PEAK factory for more information and sample
(2). Green: 3PEAK defines "Green" to mean RoHS compatible and free of halogen substances.
3PEAK and the 3PEAK logo are registered trademarks of 3PEAK INCORPORATED. All other trademarks are the property of their respective owners.